Carbureter.



J. B. KELLY.

CARBURETER.

APPLICATION FILED 111111.21, 1910.'

Patented Feb. 14,1911.

STATMEPATENT "JonN'fn xnnmnbrcrtIcAooQILLmoIs. u;

CARBUIRETEB. j

-u "L ai:y Specification ot Letteretemente` i N gina n i Application ledMarch 21, 1910. lSerial Ho. 550,737. Y

B e itltnown that I, JOHN B. Knlafr, a

citizen of theUnited States, residing at improved `means ,forcontrolling the admissionof air, for mixture with the fuel-oil,

into. the mixing chamber, whereby the proper;` amount of air may besupplied regardless of the speed at which the engine Isupplied therefromoperates. .15, t

, view in sectional elevation a carbureter con-y structedv1nacco-rdance'w1th my invention.

gThe accompanying drawing shows by a The mixing chamber of thecarbureter is -illustrated at 7 and is formed with an outlet `8controlled by a throttle-valve 8, and com- -municates with anair-conducting passage 9 below it. The passage 9 contains an upwardlyopening nozzle 10 which communicates through the passage 11 with theusual valve-equipped gasolene supply chamber (not shown).

Screwed into an opening 29 in the wall of the chamber 7 directly abovethe passage 9 is a plug 30 containing an opening 31 with tlie wall ofwhich a needle-Valve 32 has 'screw-threaded connection for the purposeof permitting the valve to be adjusted up and down. The lower end ofthis valve which is of inverted conical form, as represented at 33, isarrangedconcentric with relation to the outlet 34 ofthe nozzle 10, thewall of which is of inverted truste-conical shape as representedcat 35.

The passage 9 opens into a combined priming cup and air-inlet device 3Gwhich,

.. in its preferred embodiment, is formed of a cup-shaped member 37containing a plurality screwed into the circular wall 38 forming thepassage 9 and i I of radially-disposed openings 39"rea`ching short ofthe bottom of the cup.

Screwed into one end of the wall 40 forming the mixing chamber 7 is aplug 4l formed with a 'relatively large circular opening 42 having itsinner edge beveled as indicated at 43. The outer end of this plug is ofspiderframe construction as represented at 44, the central hub-portion45 of which contains an opening 46 of angleshape in cross-section inhaving a beveled edge-portion 49 at 'which 1t 1s adapted to seat againstthe beveled portion 43 of the plug 41. The opposite end and is threadedexternally as represented at 50, issurrounded by an internally-screwthreaded sleeve 51 screwed upon the threads 50 and adjustable thereonfor a ,purpose stem 47 carrying a nut 52 adapted to hold the sleeve 51on the stem 47 invv adjusted position. The sleeve "51 is also externallythreaded as representedJ and screwing upon these threads is a nut 53 ofpreferably hex` agonal form, this nut having one face recessed asrepresented at' 54 for receiving' one end of a coiled spring 55, thisspring'being confiired between the nut 53 and a dust-cap the plug 41. Anut-lock 58 secured to'the stem 47 between thesleeve 51 and the nut 52,coperates at its free flexible end-portion 59 with the nut 53 forholding the latterin adjusted position on the sleeve 51.

In the opgigition of the engine equipped with the carbureter, the oil isdrawn, by the engine suction, from the supply thereof through the nozzle10 into the mixing-chamthrough the openings in the priming cup, it beingunderstood that the latter is adjusted in the wall 38 to cause it topermit the requisite amount of air to enter the passage 9 for operatingthe engine at low speed. The valve 48 is an auxiliary 'air-valve forsupplying air, under the suction action of the engine, to themixing-chamber 7, in addition to that supplied through the cup, or mainair-inlet 36, when the engine is operating at intermediate and highspeeds. It is preferred that the valve 48 be first adjusted to regulatethe air supplied through it for run- I ning the engine at high speed,this being done by screwing the sleeve 51 on the stem 47 to a positionin which the inner end of this sleeve is spaced from thehub 57 adistance equal to the displacement of the disk from the seat 49necessary for admitting to the chamberl 7 the proper Volume of forrunning the engine at high speed. After this adjustment has been made,the nut' 53 should be adjusted on the sleeve 51, while the engine isrunning at intermediate speed,

which a valve-stem 47 is" Yr ciprocably supported. The inner end of"`tto so tension the spring as to cause the rroper amount of air to enterthechamber of the stem 47 which is reduced in diameterhereinafterexplained, the outer end of the 5G surrounding a shouldered portion 57of the stem 47 carries a. 'circular valve-disk 48 I ber 7 where it ismixed with the air supplied for running the engine at speedsintermediate high and low speeds.

By forming the auxiliary air-inlet valve as described, it is rendered,by reason of the spring feature, sufficiently sensitive to cause. it tooperate When the engine is running at sp'e'eds intermediate the 10W andhigh speeds, to supply to the earbureter the requisite amount of air,and' operates automatically, Without interfering with or aiiecting itssensitiveness for operation at intermediate speeds, to limit the openingof the valve for controlling. the air admitted to the carbureter foroperating the engine at high speed.

What I claim as new, and desire to secure by Letters Patent, yis i l, Ina carburetor, the combination with a mixing chamber, and means forsupplying oil to said chamber, of `means for supplying air to saidchamber comprising a valve, a stop-device adjustable on the stern ofsaid valve operating to limit the opening of the latter, a springsurrounding the valve-stem for yieldingly holding Vthe Valve to its.seat, and means for adjusting the tension of the springiffor the purposeset forth.

2. Ina carbureter, the combination with a mixing-chamber,- and means forsupplying oil to said chamber, of means for supplying air vtheretgcomprising a valve, a sleeve threaded on the stem of said Valveoperating to limit the opening of the valve, a nut screwing upon thesleeve, and a coiled spring surrounding. the valve-stem and coperatingwith said nut for yieldingly holding the valve to its seat. Y

3. ln a carburetor, the combination with a.

air to the chamber comprising a stationary member formed With avalve-seat through which said chamber communicates 'with the atmosphere,a reciprocable stem carrying a member adapted to bear against said seatto close the Valve, a stop-device adjustable on said stem and operatingin conjunction with said stationary member to limit the movement of saidstem, a spring operating to yieldingly hold the Valve closed, and meansfor adjusting the tension of said spring independently of saidstop-device, for the pur-v pose set forth. l

4. In a carbureten the combination .with a mixing-chamber, and means forsupplying.

oil to said chamber', ofmeans for supplying air to said chamber'comprising a valve, an

With said valve for holding it yieldingly against its seat, andadjustable independently 'of said stop-device, and Without varying theadjustment of the latter, for the lpurpose set forth.

lR. SCHAEFER,

JOHN WILSON.

` adjustable stop-'device for limiting the opening of said valve, and aspring cooperating

